What happened?
My daughter played with baby dolls - mothering them and taking care of them. My son? He ran around the backyard using sticks as guns. He also liked to use Barbie dolls as hammers.
My wife and I learned there’s some things girls like to do and some things boys like to do. It appears to be biological. We’ve known a few other couples who tried the same thing and had similar results. Leads me to believe the difference between the sexes is nature, not nurture, and probably goes back tens of thousands of years.